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A man standing on a road has to hold his...

A man standing on a road has to hold his umbrella at `30^(@)` with the vertical to keep the rain away. He throws the umbrella and starts running at 10km/hr. He finds that rain drop are hitting his head vertically. Find the speed of rain drops with respect to (a) road (b) the moving man.

A

20 km/hr.

B

`10 sqrt(3) km//hr`.

C

`(10)/sqrt(3)km//hr`.

D

10 km/hr.

Text Solution

Verified by Experts

The correct Answer is:
B
`tan 30^(@)=(v_(m))/(v_(rm))`
`v_(rm)=(10)/(1sqrt(3))=10sqrt(3) km//hr`.
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